${?}_{{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_s\text{t}\text{r}\text{a}\text{t}\text{e}\text{g}\text{i}\text{e}\text{s}\text{a}\text{t}\text{t}\text{e}\text{m}\text{p}\text{t}to\text{l}\text{o}\text{a}\text{d}\text{a}\text{p}\text{i}\text{e}\text{c}\text{e}of\text{p}\text{r}\text{o}\text{g}\text{r}\text{a}\text{m}or\text{d}\text{a}\text{t}\text{a}\text{i}\text{n}\text{t}\text{o}\text{m}\text{e}\text{m}\text{o}\text{r}\text{y}\text{b}\text{e}\text{f}\text{o}\text{r}\text{e}itis\text{r}\text{e}\text{f}\text{e}\text{r}\text{e}\text{n}\text{c}\text{e}\text{d}\text{.}}$

Demand fetch

Anticipatory fetch

First$-$fit placement

Next$-$fit placement